The 20oz soft flask features a twist locking cap that allows you to shut off the water when you stash it in a compression vest or belt! Perfect to hold by hand on a run, easy to click the cap in place to slip into a front vest pocket or stash in your backpack or belt, gives you control of where your water or liquids go. Cap Locking Construction: The twist locking cap with bite valve is designed for leak proof transport, the 42mm opening sized for easy filling and ice with self-cleaning bite valve. Compatible Design Ideal size for hydration vest, belt, or pack pockets. The flask material is soft and conforms to any pocket for a comfortable carry experience. Twist locking cap with bite valve Bite valve features, High flow domed post and blaster compression system that control the water distribution when you use it. Max Fill design with wide flange and 3D bottom shape for more volume in shorter dimension. Flexible design shrinks as you drink reducing the movement and easily packs away when empty. Works great with all Nathan hydration vests, packs, and wide compression belts. Does not feature exo-spine. Capacity: 20oz / 591mL
